Meet The Parents actress Blythe Danner said the couple are still going strong after four-and-a-half years of marriage.
She told OK!: "Oh good god! It's just tragic that people have to make up stuff and write stuff. I've never seen two happier parents and people. I don't get it."
She also hit out at claims that Paltrow plans to put acting on the "backburner" to concentrate on her family, saying: "They're saying Gwyneth isn't going to go back to work, which is a lot of BS too. She very much wants to go back to work.
"She's a great, wonderful actress. But motherhood is very important to her, as it was to me, and she's finding the balance. And it's hard to find that balance."
Danner added that she loves spending time with grandchildren Apple, three, and one-year-old Moses.
She said: "What isn't to love about being a grandmother! Everything - all the fluffy stuff. The laughter and the tickling, and just having the best time in the world. And just feeling so loved!"
> Paltrow, Martin considering adoption